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For an overview of 2mm ammunition types in various games, see 2mm.

The 2mm electromagnetic cartridge is a type of ammunition for use in weapons in Fallout 4.


Much like in Fallout 2, 2mm EC rounds are used by the incredibly powerful Gauss rifle. The rounds are exceptionally rare and expensive and take the most resources to craft.

Weapons using this ammunitionEdit


Copper (3)
Lead (2)
Oil (1)
rangeIcon range
Ammunition plant Contraptions WorkshopGametitle-FO4 CW
levelIcon level
2mm EC (10)


These vendors sell approximately 20-55 of the rare 2mm EC ammo type, refreshing their stock every 48 hours.

Vendor Name Vendor Location
Arturo Rodriguez Diamond City market
Myrna Diamond City market
Percy Diamond City market
Daisy Goodneighbor
KL-E-0 Goodneighbor
Rufus Rubins Goodneighbor
Proctor Teagan The Prydwen
Tinker Tom Railroad HQ
Cricket Boston
(Traveling merchant)
Ronnie Shaw The Castle
(after completing Old Guns)


  • 2mm EC rounds are extremely hard to find in containers at lower levels, so much so that even with investment in the Scrounger perk it is possible that even by level 25-30 the Sole Survivor might only find a single stash of these rounds. Thankfully they are more commonly found after level 30.
  • Note the stores only sell a very low amount of 2mm EC rounds but are very expensive, they will however replenish them after 48 hours.
  • To gain large quantities of 2mm EC ammo fast, one may go to Diamond City market, buy out all vendors' ammo, then wait 48 hours on any local chair (barstool, barbershop's sofa, etc.) to replenish the vendors' ammo stock.

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